package June;

public class Test_5_2 {
    public static void main(String[] args) {
        // 求出1-1/2+1/3-1/4.....1/100的和

        //思路分析
        //如果是偶数，就减掉
        //如果是奇数，就加
        //代码实现
        double sum = 0;
        for (int i = 1; i <= 100; i++) {
            if (i % 2 ==0) {
                sum = sum - 1.0 / i;
            } else {
                sum = sum + 1.0 / i;
            }
        }
        System.out.println(sum);
    }
}
